due date: 12-31-16

Computer Networks (IT210)

Assignment 4

Q. Explain about different connection services in transport layer with suitable diagram (0.5)

Q. What is the key difference between Go Back N-ARQ and Selective Repeat ARQ? (0.5)

Q. Describe how a TCP connection is terminated. (0.5)

Q. Why is a connection establishment for mail transfer needed if TCP has already established a connection? (0.4)

Q. Tell the maximum send and receive window size for Go-Back-NARQ and Selective-Repeat ARQ while using five bit sequence numbers. (0.4)

Q. When closing a TCP connection, why is the two-segment-lifetime timeout not necessary on the transition from LAST ACK to CLOSED? (0.5)

Q. Explain why FTP does not have a message format. (0.2)

Q. Give short answers of the following questions (1)

1. In electronic mail, what is MIME?

2. What is the purpose of FTP?

3. Why was there a need for DDNS?

4. What is an advantage of a hierarchical name space over a flat name space for a system the size of the Internet?

5. Describe the functions of the two FTP connections